Bump node-forge and firebase-admin in /functions/testapp/functions

Bumps [node-forge](https://github.com/digitalbazaar/forge) to 1.3.2 and updates ancestor dependency [firebase-admin](https://github.com/firebase/firebase-admin-node). These dependencies need to be updated together.


Updates `node-forge` from 0.7.4 to 1.3.2
- [Changelog](https://github.com/digitalbazaar/forge/blob/main/CHANGELOG.md)
- [Commits](digitalbazaar/forge@0.7.4...v1.3.2)

Updates `firebase-admin` from 5.10.0 to 13.6.0
- [Release notes](https://github.com/firebase/firebase-admin-node/releases)
- [Changelog](https://github.com/firebase/firebase-admin-node/blob/master/CHANGELOG.md)
- [Commits](firebase/firebase-admin-node@v5.10.0...v13.6.0)

---
updated-dependencies:
- dependency-name: node-forge
  dependency-version: 1.3.2
  dependency-type: indirect
- dependency-name: firebase-admin
  dependency-version: 13.6.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]